Condensed Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Condensed Consolidated Statements of Operations
Net sales	$ 195,877	$ 172,113	$ 546,008	$ 512,550
Cost of sales	105,724	96,390	301,461	284,276
Gross profit	90,153	75,723	244,547	228,274
Operating expenses:
Research and development and other engineering	9,226	8,916	27,018	27,156
Selling	20,630	20,941	63,654	61,255
General and administrative	28,781	23,843	83,666	77,174
Loss on sales of assets	631	33	634	42
Total operating expenses	59,268	53,733	174,972	165,627
Income from operations	30,885	21,990	69,575	62,647
Interest income (expense), net	(9)	55	32	177
Income before taxes	30,876	22,045	69,607	62,824
Provision for income taxes	10,870	9,069	26,304	26,788
Net income	$ 20,006	$ 12,976	$ 43,303	$ 36,036
Earnings per common share:
Basic (in dollars per share)	$ 0.41	$ 0.27	$ 0.89	$ 0.75
Diluted (in dollars per share)	$ 0.41	$ 0.27	$ 0.89	$ 0.74
Number of shares outstanding
Basic (in shares)	48,377	48,346	48,482	48,322
Diluted (in shares)	48,551	48,390	48,603	48,385
Cash dividends declared per common share (in dollars per share)	$ 0.125	$ 0.125	$ 0.250	$ 0.375

The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use; (3) to conduct internal product testing; (4) or to provide engineering support to customers in the form of testing services or product uses, specifications or requirements.

No definition available.